Multifunctional Material: Bistable Metal–Cyanide Polymer of Rubidium Manganese Hexacyanoferrate

Abstract

Since phase-transition phenomena in solid-state materials can change the magnetic, electrical, and optical properties with external stimuli, they are attracting widespread attention from the viewpoints of both fundamental science and practical applications. We have synthesized various cyano-bridged metal complexes possessing anomalous bistabilities that exhibit unprecedented phase transition phenomena. This paper focuses on rubidium manganese hexacyanoferrate, Rb x Mn[Fe(CN) 6 ] (x+2)/3 ¢zH 2 O, which is a Prussian blue analogue. Here, the unique functionalities of rubidium manganese hexacyanoferrate are described: a charge-transfer-induced phase transition, control of the thermal hysteresis loop, and a huge thermal hysteresis with a hidden stable phase are presented as thermally-induced phase-transition phenomena, while a photoinduced phase collapse is described as a novel photoinduced phase-transition phenomenon. A one-shot-laserinduced charge-transfer phase transition is displayed as a photoinduced phase-transition phenomenon at ambient temperature. Moreover, second harmonic generation (SHG) and magnetization-induced second harmonic generation (MSHG) are provided as correlation effects between the optical and dielectrical properties. Finally, a one-shot-laserinduced photo-demagnetization and reversible photomagnetic switching between ferromagnetism and antiferromagnetism are demonstrated as photomagnetic effects.

General Landau theory of non-symmetry-breaking and symmetry-breaking spin transition materials

“…Spin-transition materials, including the families of spin-crossover, [1][2][3] charge-transfer (CT) systems [4][5][6][7] , may undergo various types of phase transitions. The concept of molecular bistability expands to various types of systems exhibiting electronic and/or structural bistability between states of different entropy and volume.…”

Light-induced decarboxylation in a photo-responsive iron-containing complex based on polyoxometalate and oxalato ligands

“… 1 As an external stimulus, light has been extensively used in this context. Thus, many examples of photomagnetic materials, 2 photochromic materials, 3 and electrochromic materials 4 have been reported.…”

3D Printed Photoresponsive Devices Based on Shape Memory Composites

“…Stimuli‐responsive devices are eliciting widespread interest due to their ability to sense and then act according to a predetermined sequence when triggered by external stimuli such as heat, light, or electricity, which arises from the conformational changes of their constituent stimuli‐responsive polymers . Meanwhile, 3D printing is able to endow devices with complex geometries of precisely prescribed microarchitectures, in order to satisfy individual needs and requirements .…”